diff options
Diffstat (limited to 'power')
| -rw-r--r-- | power/Android.mk | 4 | ||||
| -rw-r--r-- | power/power.c | 204 |
2 files changed, 208 insertions, 0 deletions
diff --git a/power/Android.mk b/power/Android.mk new file mode 100644 index 0000000..fe671a5 --- /dev/null +++ b/power/Android.mk @@ -0,0 +1,4 @@ +# Copyright 2006 The Android Open Source Project + +LOCAL_SRC_FILES += power/power.c + diff --git a/power/power.c b/power/power.c new file mode 100644 index 0000000..907726a --- /dev/null +++ b/power/power.c @@ -0,0 +1,204 @@ +#include <hardware/power.h> +#include <fcntl.h> +#include <errno.h> +#include <stdlib.h> +#include <stdio.h> +#include <unistd.h> +#include <sys/time.h> +#include <time.h> +#include <errno.h> +#include <string.h> +#include <sys/stat.h> +#include <sys/types.h> +#include <pthread.h> + +#define LOG_TAG "power" +#include <utils/Log.h> + +enum { + ACQUIRE_PARTIAL_WAKE_LOCK = 0, + ACQUIRE_FULL_WAKE_LOCK, + RELEASE_WAKE_LOCK, + REQUEST_STATE, + OUR_FD_COUNT +}; + +const char * const PATHS[] = { + "/sys/android_power/acquire_partial_wake_lock", + "/sys/android_power/acquire_full_wake_lock", + "/sys/android_power/release_wake_lock", + "/sys/android_power/request_state" +}; + +const char * const AUTO_OFF_TIMEOUT_DEV = "/sys/android_power/auto_off_timeout"; + +const char * const LCD_BACKLIGHT = "/sys/class/leds/lcd-backlight/brightness"; +const char * const BUTTON_BACKLIGHT = "/sys/class/leds/button-backlight/brightness"; +const char * const KEYBOARD_BACKLIGHT = "/sys/class/leds/keyboard-backlight/brightness"; + +//XXX static pthread_once_t g_initialized = THREAD_ONCE_INIT; +static int g_initialized = 0; +static int g_fds[OUR_FD_COUNT]; +static int g_error = 1; + + +static int64_t systemTime() +{ + struct timespec t; + t.tv_sec = t.tv_nsec = 0; + clock_gettime(CLOCK_MONOTONIC, &t); + return t.tv_sec*1000000000LL + t.tv_nsec; +} + +static void +open_file_descriptors(void) +{ + int i; + for (i=0; i<OUR_FD_COUNT; i++) { + int fd = open(PATHS[i], O_RDWR); + if (fd < 0) { + fprintf(stderr, "fatal error opening \"%s\"\n", PATHS[i]); + g_error = errno; + return; + } + g_fds[i] = fd; + } + + g_error = 0; +} + +static inline void +initialize_fds(void) +{ + // XXX: should be this: + //pthread_once(&g_initialized, open_file_descriptors); + // XXX: not this: + if (g_initialized == 0) { + open_file_descriptors(); + g_initialized = 1; + } +} + +int +acquire_wake_lock(int lock, const char* id) +{ + initialize_fds(); + +// LOGI("acquire_wake_lock lock=%d id='%s'\n", lock, id); + + if (g_error) return g_error; + + int fd; + + if (lock == PARTIAL_WAKE_LOCK) { + fd = g_fds[ACQUIRE_PARTIAL_WAKE_LOCK]; + } + else if (lock == FULL_WAKE_LOCK) { + fd = g_fds[ACQUIRE_FULL_WAKE_LOCK]; + } + else { + return EINVAL; + } + + return write(fd, id, strlen(id)); +} + +int +release_wake_lock(const char* id) +{ + initialize_fds(); + +// LOGI("release_wake_lock id='%s'\n", id); + + if (g_error) return g_error; + + ssize_t len = write(g_fds[RELEASE_WAKE_LOCK], id, strlen(id)); + return len >= 0; +} + +int +set_last_user_activity_timeout(int64_t delay) +{ +// LOGI("set_last_user_activity_timeout delay=%d\n", ((int)(delay))); + + int fd = open(AUTO_OFF_TIMEOUT_DEV, O_RDWR); + if (fd >= 0) { + char buf[32]; + ssize_t len; + len = sprintf(buf, "%d", ((int)(delay))); + len = write(fd, buf, len); + close(fd); + return 0; + } else { + return errno; + } +} + +static void +set_a_light(const char* path, int value) +{ + int fd; + + // LOGI("set_a_light(%s, %d)\n", path, value); + + fd = open(path, O_RDWR); + if (fd) { + char buffer[20]; + int bytes = sprintf(buffer, "%d\n", value); + write(fd, buffer, bytes); + close(fd); + } else { + LOGE("set_a_light failed to open %s\n", path); + } +} + +int +set_light_brightness(unsigned int mask, unsigned int brightness) +{ + initialize_fds(); + +// LOGI("set_light_brightness mask=0x%08x brightness=%d now=%lld g_error=%s\n", +// mask, brightness, systemTime(), strerror(g_error)); + + if (mask & KEYBOARD_LIGHT) { + set_a_light(KEYBOARD_BACKLIGHT, brightness); + } + + if (mask & SCREEN_LIGHT) { + set_a_light(LCD_BACKLIGHT, brightness); + } + + if (mask & BUTTON_LIGHT) { + set_a_light(BUTTON_BACKLIGHT, brightness); + } + + return 0; +} + + +int +set_screen_state(int on) +{ + //LOGI("*** set_screen_state %d", on); + + initialize_fds(); + + //LOGI("go_to_sleep eventTime=%lld now=%lld g_error=%s\n", eventTime, + // systemTime(), strerror(g_error)); + + if (g_error) return g_error; + + char buf[32]; + int len; + if(on) + len = sprintf(buf, "wake"); + else + len = sprintf(buf, "standby"); + len = write(g_fds[REQUEST_STATE], buf, len); + if(len < 0) { + LOGE("Failed setting last user activity: g_error=%d\n", g_error); + } + return 0; +} + + |